package ten.test_10_15;

import java.util.Scanner;

public class TestMain3 {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        int n = scanner.nextInt();
        if(n < 4) {
            System.out.println(0);
        }
        if(n == 4) {
            System.out.println(10);
        }
    }
}
